"The launch of SpaceX's next cargo mission to the International Space Station is expected to be rescheduled for no earlier than Friday morning, allowing more time for NASA ground teams to troubleshoot an issue with the station's electrical power system", Spaceflight Now tweeted late Monday night. Officials had said the first flight with astronauts may be as early as this summer, but the program is under review.

Power on the station is generation by its solar arrays and is then fed through the power channels.

The resupply mission, initially scheduled to launch on April 26, has been pushed back to April 30 due to "station and orbital mechanics constraints", and slipped again to Wednesday, or May 1. Nasa wants to replace the failed unit to restore full power before sending up the SpaceX Dragon cargo capsule.

"Air traffic controllers worked to route power through the remaining six power channels".

NASA said Tuesday the station and its six astronauts are safe.

Unlike Russian Progress supply ships that fly themselves all the way in to docking at one of four Russian ports at the station, the Dragon relies on the US segment's 50-foot-long robot arm to capture it and pull it in for berthing at the Earth-facing port of the forward Harmony module. CanadArm 2 has two power systems - and while only one is used, the other is a backup. Northrop Grumman launched supplies two weeks ago.

Thankfully, no one is in immediate danger, but the partial power loss means that SpaceX is going to need to wait before launching its CRS-17 Dragon resupply mission carrying almost 5,500 pounds of experiments and supplies. But the accident is sure to delay launching a crew Dragon with two NASA astronauts on board. SpaceX had been aiming for a summertime flight.

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